Extreme Networks EAS 100-24t Switch CLI Manual
13
CHAPTER
2
Interface and Hardware
Cable Diagnostics Commands
The cable diagnostics commands in the command-line interface (CLI) are listed (along with the
appropriate parameters) in the following table.
Each command is listed, in detail, in the following sections.
Command Parameters
cable_diag ports [<portlist> | all]
cable_diag ports
Purpose Used to test the copper cable. If there is an error on the cable, it can determine the
type of error and the position where the error occurred.
Syntax cable_diag ports [<portlist> | all]
Description For FE port, two pairs of cable will be diagnosed. The type of cable error can be open
and short. Open means that the cable in the error pair does not have a connection at
the specified position. Short means that the cables in the error pair has a short problem
at the specified position. When a port is in link-up status, the test will obtain the
distance of the cable. Since the status is link-up, the cable will not have the short or
open problem. When a port is in link-down status, the link-down may be caused by
many factors. When the port has a normal cable connection, but the remote partner is
powered off, the cable diagnostics can still diagnose the health of the cable as if the
remote partner is powered on.
When the port does not have any cable connection, the result of the test will indicate
no cable. The test will detect the type of error and the position where the error occurs.
Note that this test will consume a low number of packets. Since this test is for copper
cable, the port with fiber cable will be skipped from the test. Some phy chips can’t
support Cable Diagnostics function, and it will display at the result.
NOTE: If the Link Status field for an interface displays "Link Up", the value displayed in
the Cable Length field may not be accurate for the interface.
Parameters <portlist> - Specifies a range of ports to be tested.
all - All ports
Restrictions None.
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